Relaxation oscillator

About: Relaxation oscillator is a research topic. Over the lifetime, 1952 publications have been published within this topic receiving 22326 citations.

Relay switch control circuit including oscillator

Abstract: An electrical circuit controls a relay switch. The control circuit includes a controllable switch and a relay coil in series. An oscillator generates different output signals according to the value of its input voltage. The oscillator output is used for switching off, switching on, and clocked on and off switching of the following switch. The oscillator includes two series-connected inverters and a network composed of an ohmic resistor and a feedback capacitor. The oscillator frequency is inversely proportional to the time constant derived from the ohmic resistor and the capacitor. The oscillator frequency is variable via the input voltage.

A relaxation oscillator with multi-phase triangular waveform generation

Abstract: This paper firstly presents a CMOS voltage-controlled oscillator (VCO) which enables octa-phase triangular waveform generation. By utilizing a cascaded relaxation oscillator core followed by a pseudo injection-locked oscillator circuit, an octa-phase differential VCO with triangular waveform outputs is realized. Simulation results show that the proposed fully differential multi-phase VCO can achieve broad tuning range with programmable timing capacitors, offering <1% phase mismatch.

Electronic monitoring system stabilized against accidental triggering

Abstract: A contactless motion detector, including an oscillator sensitive to an approaching metallic element, includes an electronic switch such as a thyristor triggerable by an output signal from a demodulator comprising a storage capacitor which is alternately chargeable and dischargeable, preferably with constant current, during each cycle of a high-frequency voltage generated by the oscillator. The oscillator voltage is compared with a reference voltage by means of a differential amplifier causing the flow of a charging current into the capacitor when the oscillator voltage exceeds the reference voltage whereas a discharging current flows out of that capacitor in the opposite case. The reference voltage is so chosen that the capacitor charge rises in the course of a few cycles above a predetermined threshold when the oscillator voltage is high but remains below that threshold when it is low.

A 0.18- $\mu$ m CMOS Voltage-to-Frequency Converter With Low Circuit Sensitivity

Abstract: A process, voltage, and temperature insensitive resistor-to-frequency converter is proposed. This insensitivity is achieved by matching the current-defining capacitor in a novel switched-capacitor (SC) voltage-to-current ( $V$ – $I$ ) converter with the integrating capacitor in a conventional relaxation oscillator. Implemented in 0.18- $\mu \text{m}$ CMOS technology, the SC $V$ – $I$ converter together with the relaxation oscillator and voltage regulator occupies 0.45 mm2. This paper has shown a sensitivity of 199.9 Hz/( $\mu \Omega /\Omega)$ , which is based on a center frequency of 125 kHz. Testing with a commercial sensor, the sensor interface has demonstrated a sensitivity of 1.269 kHz/psi. The sensor interface consumes only $112.5~\mu \text{W}$ at 1.5-V power supply. Therefore, it is suitable for Internet-of-Things applications.